Of or having to do with X-rays.

Short wavelength electromagnetic radiation usually produced by bombarding a metal target in a vacuum. Used to create images of the internal structure of objects; this is possible because X-rays pass through most objects and can expose photographic film.

(transitive, informal) To take a radiograph of; to obtain an image of using X-ray radiation, especially for the purpose of medical diagnostic evaluation.

(originally) A generation of people whose future is uncertain; a lost generation.

A prize, usually a multi-million dollar monetary one, offered for a specific scientific or technological advance.

A utility knife, usually with a short, sharp, disposable blade mounted on a pen-like body, usually for crafts and hobbies; an X-Acto knife.

A pair of flat or curved stretchers, on a chair etc., that often have a knob at the intersection

(genetics) A non-linear strand of DNA where certain cruciform binding proteins can compete for binding.

(fandom slang) A fan of the television series The X-Files.

(genetics) A mammalian sex chromosome. Cells of females have a pair of X chromosomes while cells of males have an X and a Y.